In situ data: ICOADS2.5 before 2007 and NCEP in situ data from 2008 to present. Ice data: HadISST ice before 2010 and NCEP ice after 2010.

<unknown>

The GISTEMP dataset is a global 2x2 gridded temperature anomaly dataset. Temperature data is updated around the middle of every month using current
data files from NOAA GHCN v3 (meteorological stations), ERSST v5 (ocean areas), and SCAR (Antarctic stations), combined as described in the December
2010 publication (Hansen et al. 2010). These updated files incorporate reports for the previous month and also late reports and corrections for
earlier months. Please refer to the NASA webpage for more details, caveats, and products.

First is the monitoring product for the period 1982 to present, based on quality-controlled data from 7,000 stations. The second is the Full Data
Product (V2020) for the period 1891 to 2019, based on quality-controlled data from from 67,200 stations world-wide that feature record durations of
10 years or longer. This product contains the monthly totals on a regular grid with a spatial resolution of 0.25° x0.25° , 0.5° x 0.5°, 1.0° x
1.0°, and 2.5° x 2.5° latitude by longitude. Precipitation anomalies at the stations are interpolated and then superimposed on the GPCC

http://eagle1.umd.edu/GPCP_ICDR/GPCPmonthlyV2.3.pdf

The gridded data are a blend of the CRUTEM4 land-surface air temperature dataset and the HadSST3 sea-surface temperature (SST) dataset. The dataset is presented as an ensemble of 100 dataset realisations that sample the distribution of uncertainty in the global temperature record given current understanding of non-climatic factors affecting near-surface temperature observations.

Surface marine observational records from ships, buoys, and other platform types are processed and binned creating monthly global and regional grids of the observations along with processing statistics such as stand deviation and number of obs. Data starts back as far as 1662 and some grids are update to the present.

<unknown>

<unknown>

The NCEP-DOE Reanalysis 2 project is using a state-of-the-art analysis/forecast system to perform data assimilation using past data from 1979 through near present. Data is output on 17 pressure levels and on single level grids. Data is output 4x daily and is also available as daily and monthly. Climatologies are provided for select variables.